Is there anyway people with smaller RIBs could get involved; there are loads of sub-fivers on here, and if some sort of "weighting" system was used to give people a more level playing field it could work quite well.

The only thing for RIBs your size at the moment would be Poker runs, although there is a minimum speed, not sure what that is, but have a look at the one Drivers Wharf are doing, the details are on Boatmad.com. The only RYA RIB racing is for 200hp boats, and it would have to be longer than yours as well!

Sorry not to give you more positive news, but Poker runs are a great way of seeing a wide variety of boats in a non competitive atmosphere.